COLL 507 |
| Gabriel P. Lopez, Chemical Engineering and Chemistry, Chemical Engineering and Chemistry, University of New Mexico, MSC01 1120, Albuquerque, NM 87131 |
| We present recent work on the stimulus-responsive behavior of flat and porous surfaces that have been modified with poly(N-isopropyl acrylamide) (PNIPAAm). Surface initiated atom transfer radical polymerization (ATRP) is used to form surface grafted smart polymers. For flat surfaces, self-assembled monolayers (SAMs) of alkanethiolates on gold are used as a versatile and controllable basis for formation of polymer brushes. The temperature-dependant properties of these smart surfaces are probed by wettability measurements, surface plasmon reflectivity and neutron scattering and modeled using self-consistent field theory. On porous materials, surface grafted smart polymers are formed by ATRP from silane coupled initiation sites. Wettability measurements, fluorescence spectroscopy, and gas adsorption measurements probe the unique and controllable transport and surface energy characteristics of these materials. Our ability to precisely vary both the structure of the polymer grafts on these surfaces and the porous structure of the metal oxide materials allows their detailed study and understanding of chemical and geometrical factors influencing their behavior. |
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“Smart” Polymers on Surfaces and Colloids
8:30 AM-11:30 AM, Thursday, April 1, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |